Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Patent
1996-03-11
1998-03-31
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
327525, G01R 2302, H01H 8500
Patent
active
057342741
ABSTRACT:
A clock frequency limiting circuit is disclosed. The clock frequency limiting circuit allows a semiconductor device to be fabricated, packaged and tested before the maximum clock frequency is set. The maximum clock frequency is set by burning a bank of on-chip fuses. The clock frequency limiting circuit counts clock cycles of an applied clock signal for a predetermined amount of time. A comparator compares the maximum clock frequency in the fuse bank and the counted clock cycles. A violation "kill" signal is asserted if the counted clock cycles exceeds the set maximum clock frequency.
REFERENCES:
patent: 5151611 (1992-09-01), Rippey
patent: 5410186 (1995-04-01), Bonaccio et al.
patent: 5410196 (1995-04-01), Izuta
patent: 5485105 (1996-01-01), Harward et al.
patent: 5508638 (1996-04-01), Cowles et al.
patent: 5592111 (1997-01-01), Wong et al.
PCT Search Report, mailed May 27, 1997.
Callahan Timothy P.
Intel Corporation
Nu Ton My-Trang
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